I suspect once the real implications of leaving become clear (regarding the new relationship) polls will shift. I think Remain would have easily won by a strong majority if our group wasn't so complacent and thought 'WE GOT THIS BRAHS'. Academics are already looking at leaving to work in EU countries. Automation will decimate unskilled work in this country, the working class would see the EU as the 'good old days' once realities hit. You really think employers won't build more shit like self service machines rather than raise wages significantly?
I think this is wishful thinking. Automation is going to happen anyway. The EU has nothing to do with that and will also be hit just as hard. The working classes in Britain aren't going to look back fondly on the days of "uncontrolled immigration" and "Brussels bureaucracy" because those narratives are too well entrenched, and because they are based on important kernels of truth (ie. EU member states can't block EU migration) which makes it very hard for pro-EU forces to gain the momentum in the debate.
I think that the damage caused by Brexit will disproportionately affect our relatively international-facing and high-skill industries, and will take months and years to unfold, as/if talent drains away, companies choose not to invest, and so on, and therefore a significant degree of any Brexit damage will be imperceptible to the average voter. Most voters are not intensely engaged in the political process and they are unlikely to
feel the impacts of Britain repealing the Third Railway Package, or leaving the European Medicines Agency, or EU Intellectual Property Office, and so on, even if they are in fact impacted by these changes in ways they don't see.
If the economic situation in the Eurozone deteriorates, which is plausible and maybe even probable, that will harden British perceptions of the EU as a 'shrinking' power and the folk wisdom that we were 'wise to get out in time'. And if post-Brexit Britain is able to match EU growth rates, I bet that British euroscepticism will be solidified for decades.